Implicit transform unit representation
View Patent ↗In one embodiment, a method includes receiving a size of a coding unit (CU) for a block of video content. Information associated with a prediction unit (PU) type for a prediction unit of the coding unit is also received. The method then applies the size of the coding unit and the information associated with the prediction unit type to a function to determine a size of at least one transform unit for the prediction unit. The size of the at least one transform unit is outputted for use in a transform operation.
1. A method comprising:
receiving a size of a coding unit (CU) for a block of video content;
receiving information associated with a prediction unit (PU) type for a prediction unit of the coding unit;
applying, by a computing device, the size of the coding unit and the information associated with the prediction unit type to a function to determine a size of at least one transform unit for the prediction unit; and
outputting the size of the at least one transform unit for use in a transform operation.
2. The method of claim 1 , wherein a residual quadtree representation (RQT) for a partitioning of transform units in the coding unit is not encoded and transmitted with compressed bitstream for the video content.
3. The method of claim 2 , wherein the residual quadtree representation (RQT) for the partitioning of transform units in the coding unit is not used to decode the prediction unit.
4. The method of claim 1 , wherein:
a variable value is derived from the PU type, and
the value is applied to the function to determine the size of the TU.
5. The method of claim 4 , wherein:
the value is set to a first value if the CU includes one PU of a same size, and
the value is set to a second value if the CU includes more than one PU.
6. The method of claim 4 , wherein:
the variable value is encoded with a compressed bitstream for the video content and sent to a decoder, and
the variable is received by the decoder and used to determine the TU size to use to decode the prediction unit.
7. The method of claim 4 , wherein an encoder and a decoder determine the variable value separately using a rule.
8. The method of claim 4 , wherein the TU size is determined based on the variable value and the size of the CU.
9. An apparatus comprising:
one or more computer processors; and
a computer-readable storage medium comprising instructions for controlling the one or more computer processors to be operable to:
receive a size of a coding unit (CU) for a block of video content;
receive information associated with a prediction unit (PU) type for a prediction unit of the coding unit;
apply the size of the coding unit and the information associated with the prediction unit type to a function to determine a size of at least one transform unit for the prediction unit; and
output the size of the at least one transform unit for use in a transform operation.
10. The apparatus of claim 9 , wherein a residual quadtree representation (RQT) for a partitioning of transform units in the coding unit is not encoded and transmitted with a compressed bitstream for the video content.
11. The apparatus of claim 10 , wherein the residual quadtree representation (RQT) for the partitioning of transform units in the coding unit is not used to decode the prediction unit.
12. The apparatus of claim 9 , wherein:
a variable value is derived from the PU type, and
the value is applied to the function to determine the size of the TU.
13. The apparatus of claim 12 , wherein:
the variable value is set to a first value if the CU includes one PU of a same size, and
the variable value is set to a second value if the CU includes more than more PU.
14. The apparatus of claim 12 , wherein:
the variable value is encoded with a compressed bitstream for the video content and sent to a decoder, and
the variable is received by the decoder and used to determine the TU size to use to decode the prediction unit.
15. The apparatus of claim 14 , wherein an encoder and a decoder determine the variable value separately using a rule.
16. The apparatus of claim 12 , wherein the TU size is determined based on the variable value and the size of the CU.
17. A non-transitory computer-readable storage medium comprising instructions for controlling the one or more computer processors to be operable to:
receive a size of a coding unit (CU) for a block of video content;
receive information associated with a prediction unit (PU) type for a prediction unit of the coding unit;
apply the size of the coding unit and the information associated with the prediction unit type to a function to determine a size of at least one transform unit for the prediction unit; and
output the size of the at least one transform unit for use in a transform operation.
18. The non-transitory computer-readable storage medium of claim 17 , wherein a residual quadtree representation (RQT) for a partitioning of transform units in the coding unit is not encoded and transmitted with the encoded video content.
19. The non-transitory computer-readable storage medium of claim 17 , wherein:
a variable value is derived from the PU type, and
the value is applied to the function to determine the size of the TU.
20. The non-transitory computer-readable storage medium of claim 19 , wherein:
the variable value is set to a first value if the CU includes one PU of a same size, and
the variable value is set to a second value if the CU includes more than more PU.